Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5071300 | Shrouded jam locknut | — | 1991-12-10 |
| 5062325 | Pipe plug and centering construction for centering ridged key in mating groove in pipe plug or nut | Jeffrey R. Sullivan | 1991-11-05 |
| 4936336 | Tamperproof construction for hydrant actuating nut | John K. Waite, John W. Erwin | 1990-06-26 |
| 4723866 | Manhole cover locking bolt construction | — | 1988-02-09 |
| 4712586 | Pipe plug and centering construction for centering ridged key in mating groove in pipe plug | Jeffrey R. Sullivan | 1987-12-15 |
| 4686874 | Tamper-proof bolt and tamper-proof bolt-key combination | Miller G. McCalmon | 1987-08-18 |